Added support for more compilers.
Added new flag GIL_NONWORD_POINTER_ALIGNMENT_SUPPORTED to indicate whether dereferencing on non-word
boundary is supported. Enabling this flag improves performance.
Fixed two bugs related to non-byte-aligned images. The image alignment parameter is now specified in
bytes, and has a default of 0, which means "packed" alignment. In particular, for non-byte-aligned
images alignment of 0 means there are no padding bits at the ends of rows.
Added the allocator as an optional parameter to image constructors and image recreate methods.
[SVN r41165]
1. changed int to std::ptrdiff_t in utilities.hpp and iterator_from_2d.hpp for problems under 64-bit platforms
2. removed several extra semi-colons after GIL_CLASS_REQUIRE
[SVN r39376]
